D--i, iii and iv are correct
Correct Answer:-Question Cancelled
Question79:-An electron in a constant electric field
A:-will not experience any force
B:-will move in a direction perpendicular to that of electric field
C:-will move in the direction of electric field
D:-will move in the opposite direction of electric field
Correct Answer:- Option-D

Question80:-9 Ohm and 2 Ohm are the effective resistance when two resistors are
connected in series and parallel respectively. The individual resistances are

A:-5 Ohm and 4 Ohm
B:-6 Ohm and 3 Ohm
C:-7 Ohm and 2 Ohm
D:-8 Ohm and 1 Ohm
Correct Answer:- Option-B
Question81:-When an electron revolving around the nucleus of an atom
A:-It is equivalent to a circular loop of current and will produce magnetic field

B:-As electrons have negative charge it cannot be considered as a circular loop
of current

C:-The rotation of electrons never produce any magnetic field
D:-Circular loops of current never produce magnetic fields
Correct Answer:- Option-A

Question82:-When two infinite parallel conductors are held parallel to each other
and currents are flowing in the same direction

A:-The conductors will repel each other and the repulsive force is independent
of currents

B:-The conductors will repel each other and the repulsive force depends on
currents

C:-The conductors will attract each other and the attractive force is
independent of currents

D:-The conductors will attract each other and the attractive force depends on
currents

Correct Answer:- Option-D

Question83:-A boy suffered from severe fever and admitted in the hospital. His
body temperature is measured to be 100 by a thermometer. But when a drop of
water accidently incident on his body, it didn't boil.

Choose the correct reason for the above.

A:-Human body will not boil water as ordinary heat sources

B:-The drop of water decreases the body temperature at that moment and